Revert "Refactor migration precondition to read better"
Revert "Refactor migration precondition to read better"

Realm cannot translate `.All()` LINQ queries.

This reverts commit 0e0e8c25e8587e0fd121d1c4a0ad8cfe9055a08f.

NeoAdonis/osu,peppy/osu,ppy/osu,peppy/osu,ppy/osu,NeoAdonis/osu,NeoAdonis/osu,ppy/osu,peppy/osu